drivers/s390/block/dasd

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This source file includes following definitions.
dasd_get_device
dasd_put_device
dasd_init_chunklist
dasd_alloc_chunk
dasd_free_chunk
dasd_check_blocksize
dasd_parse
dasd_path_is_operational
dasd_path_need_verify
dasd_path_verify
dasd_path_clear_verify
dasd_path_clear_all_verify
dasd_path_operational
dasd_path_nonpreferred
dasd_path_is_nonpreferred
dasd_path_clear_nonpreferred
dasd_path_preferred
dasd_path_is_preferred
dasd_path_clear_preferred
dasd_path_clear_oper
dasd_path_clear_cable
dasd_path_cuir
dasd_path_is_cuir
dasd_path_clear_cuir
dasd_path_ifcc
dasd_path_is_ifcc
dasd_path_clear_ifcc
dasd_path_clear_nohpf
dasd_path_miscabled
dasd_path_is_miscabled
dasd_path_nohpf
dasd_path_is_nohpf
dasd_path_get_opm
dasd_path_get_tbvpm
dasd_path_get_nppm
dasd_path_get_ppm
dasd_path_get_cablepm
dasd_path_get_cuirpm
dasd_path_get_ifccpm
dasd_path_get_hpfpm
dasd_path_add_tbvpm
dasd_path_get_notoperpm
dasd_path_add_opm
dasd_path_add_cablepm
dasd_path_add_cuirpm
dasd_path_add_ifccpm
dasd_path_add_nppm
dasd_path_add_nohpfpm
dasd_path_add_ppm
dasd_path_set_tbvpm
dasd_path_set_opm
dasd_path_remove_opm
dasd_path_available
dasd_path_notoper
dasd_path_no_path
   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
   4  *                  Horst Hummel <Horst.Hummel@de.ibm.com>
   5  *                  Martin Schwidefsky <schwidefsky@de.ibm.com>
   6  * Bugreports.to..: <Linux390@de.ibm.com>
   7  * Copyright IBM Corp. 1999, 2009
   8  */
   9 
  10 #ifndef DASD_INT_H
  11 #define DASD_INT_H
  12 
  13 /* we keep old device allocation scheme; IOW, minors are still in 0..255 */
  14 #define DASD_PER_MAJOR (1U << (MINORBITS - DASD_PARTN_BITS))
  15 #define DASD_PARTN_MASK ((1 << DASD_PARTN_BITS) - 1)
  16 
  17 /*
  18  * States a dasd device can have:
  19  *   new: the dasd_device structure is allocated.
  20  *   known: the discipline for the device is identified.
  21  *   basic: the device can do basic i/o.
  22  *   unfmt: the device could not be analyzed (format is unknown).
  23  *   ready: partition detection is done and the device is can do block io.
  24  *   online: the device accepts requests from the block device queue.
  25  *
  26  * Things to do for startup state transitions:
  27  *   new -> known: find discipline for the device and create devfs entries.
  28  *   known -> basic: request irq line for the device.
  29  *   basic -> ready: do the initial analysis, e.g. format detection,
  30  *                   do block device setup and detect partitions.
  31  *   ready -> online: schedule the device tasklet.
  32  * Things to do for shutdown state transitions:
  33  *   online -> ready: just set the new device state.
  34  *   ready -> basic: flush requests from the block device layer, clear
  35  *                   partition information and reset format information.
  36  *   basic -> known: terminate all requests and free irq.
  37  *   known -> new: remove devfs entries and forget discipline.
  38  */
  39 
  40 #define DASD_STATE_NEW    0
  41 #define DASD_STATE_KNOWN  1
  42 #define DASD_STATE_BASIC  2
  43 #define DASD_STATE_UNFMT  3
  44 #define DASD_STATE_READY  4
  45 #define DASD_STATE_ONLINE 5
  46 
  47 #include <linux/module.h>
  48 #include <linux/wait.h>
  49 #include <linux/blkdev.h>
  50 #include <linux/genhd.h>
  51 #include <linux/hdreg.h>
  52 #include <linux/interrupt.h>
  53 #include <linux/log2.h>
  54 #include <asm/ccwdev.h>
  55 #include <linux/workqueue.h>
  56 #include <asm/debug.h>
  57 #include <asm/dasd.h>
  58 #include <asm/idals.h>
  59 #include <linux/bitops.h>
  60 #include <linux/blk-mq.h>
  61 
  62 /* DASD discipline magic */
  63 #define DASD_ECKD_MAGIC 0xC5C3D2C4
  64 #define DASD_DIAG_MAGIC 0xC4C9C1C7
  65 #define DASD_FBA_MAGIC 0xC6C2C140
  66 
  67 /*
  68  * SECTION: Type definitions
  69  */
  70 struct dasd_device;
  71 struct dasd_block;
  72 
  73 /* BIT DEFINITIONS FOR SENSE DATA */
  74 #define DASD_SENSE_BIT_0 0x80
  75 #define DASD_SENSE_BIT_1 0x40
  76 #define DASD_SENSE_BIT_2 0x20
  77 #define DASD_SENSE_BIT_3 0x10
  78 
  79 /* BIT DEFINITIONS FOR SIM SENSE */
  80 #define DASD_SIM_SENSE 0x0F
  81 #define DASD_SIM_MSG_TO_OP 0x03
  82 #define DASD_SIM_LOG 0x0C
  83 
  84 /* lock class for nested cdev lock */
  85 #define CDEV_NESTED_FIRST 1
  86 #define CDEV_NESTED_SECOND 2
  87 
  88 /*
  89  * SECTION: MACROs for klogd and s390 debug feature (dbf)
  90  */
  91 #define DBF_DEV_EVENT(d_level, d_device, d_str, d_data...) \
  92 do { \
  93         debug_sprintf_event(d_device->debug_area, \
  94                             d_level, \
  95                             d_str "\n", \
  96                             d_data); \
  97 } while(0)
  98 
  99 #define DBF_EVENT(d_level, d_str, d_data...)\
 100 do { \
 101         debug_sprintf_event(dasd_debug_area, \
 102                             d_level,\
 103                             d_str "\n", \
 104                             d_data); \
 105 } while(0)
 106 
 107 #define DBF_EVENT_DEVID(d_level, d_cdev, d_str, d_data...)      \
 108 do { \
 109         struct ccw_dev_id __dev_id;                     \
 110         ccw_device_get_id(d_cdev, &__dev_id);           \
 111         debug_sprintf_event(dasd_debug_area,            \
 112                             d_level,                                    \
 113                             "0.%x.%04x " d_str "\n",                    \
 114                             __dev_id.ssid, __dev_id.devno, d_data);     \
 115 } while (0)
 116 
 117 /* limit size for an errorstring */
 118 #define ERRORLENGTH 30
 119 
 120 /* definition of dbf debug levels */
 121 #define DBF_EMERG       0       /* system is unusable                   */
 122 #define DBF_ALERT       1       /* action must be taken immediately     */
 123 #define DBF_CRIT        2       /* critical conditions                  */
 124 #define DBF_ERR         3       /* error conditions                     */
 125 #define DBF_WARNING     4       /* warning conditions                   */
 126 #define DBF_NOTICE      5       /* normal but significant condition     */
 127 #define DBF_INFO        6       /* informational                        */
 128 #define DBF_DEBUG       6       /* debug-level messages                 */
 129 
 130 /* messages to be written via klogd and dbf */
 131 #define DEV_MESSAGE(d_loglevel,d_device,d_string,d_args...)\
 132 do { \
 133         printk(d_loglevel PRINTK_HEADER " %s: " d_string "\n", \
 134                dev_name(&d_device->cdev->dev), d_args); \
 135         DBF_DEV_EVENT(DBF_ALERT, d_device, d_string, d_args); \
 136 } while(0)
 137 
 138 #define MESSAGE(d_loglevel,d_string,d_args...)\
 139 do { \
 140         printk(d_loglevel PRINTK_HEADER " " d_string "\n", d_args); \
 141         DBF_EVENT(DBF_ALERT, d_string, d_args); \
 142 } while(0)
 143 
 144 /* messages to be written via klogd only */
 145 #define DEV_MESSAGE_LOG(d_loglevel,d_device,d_string,d_args...)\
 146 do { \
 147         printk(d_loglevel PRINTK_HEADER " %s: " d_string "\n", \
 148                dev_name(&d_device->cdev->dev), d_args); \
 149 } while(0)
 150 
 151 #define MESSAGE_LOG(d_loglevel,d_string,d_args...)\
 152 do { \
 153         printk(d_loglevel PRINTK_HEADER " " d_string "\n", d_args); \
 154 } while(0)
 155 
 156 /* Macro to calculate number of blocks per page */
 157 #define BLOCKS_PER_PAGE(blksize) (PAGE_SIZE / blksize)
 158 
 159 struct dasd_ccw_req {
 160         unsigned int magic;             /* Eye catcher */
 161         int intrc;                      /* internal error, e.g. from start_IO */
 162         struct list_head devlist;       /* for dasd_device request queue */
 163         struct list_head blocklist;     /* for dasd_block request queue */
 164         struct dasd_block *block;       /* the originating block device */
 165         struct dasd_device *memdev;     /* the device used to allocate this */
 166         struct dasd_device *startdev;   /* device the request is started on */
 167         struct dasd_device *basedev;    /* base device if no block->base */
 168         void *cpaddr;                   /* address of ccw or tcw */
 169         short retries;                  /* A retry counter */
 170         unsigned char cpmode;           /* 0 = cmd mode, 1 = itcw */
 171         char status;                    /* status of this request */
 172         char lpm;                       /* logical path mask */
 173         unsigned long flags;            /* flags of this request */
 174         struct dasd_queue *dq;
 175         unsigned long starttime;        /* jiffies time of request start */
 176         unsigned long expires;          /* expiration period in jiffies */
 177         void *data;                     /* pointer to data area */
 178         struct irb irb;                 /* device status in case of an error */
 179         struct dasd_ccw_req *refers;    /* ERP-chain queueing. */
 180         void *function;                 /* originating ERP action */
 181         void *mem_chunk;
 182 
 183         unsigned long buildclk;         /* TOD-clock of request generation */
 184         unsigned long startclk;         /* TOD-clock of request start */
 185         unsigned long stopclk;          /* TOD-clock of request interrupt */
 186         unsigned long endclk;           /* TOD-clock of request termination */
 187 
 188         void (*callback)(struct dasd_ccw_req *, void *data);
 189         void *callback_data;
 190         unsigned int proc_bytes;        /* bytes for partial completion */
 191 };
 192 
 193 /*
 194  * dasd_ccw_req -> status can be:
 195  */
 196 #define DASD_CQR_FILLED         0x00    /* request is ready to be processed */
 197 #define DASD_CQR_DONE           0x01    /* request is completed successfully */
 198 #define DASD_CQR_NEED_ERP       0x02    /* request needs recovery action */
 199 #define DASD_CQR_IN_ERP         0x03    /* request is in recovery */
 200 #define DASD_CQR_FAILED         0x04    /* request is finally failed */
 201 #define DASD_CQR_TERMINATED     0x05    /* request was stopped by driver */
 202 
 203 #define DASD_CQR_QUEUED         0x80    /* request is queued to be processed */
 204 #define DASD_CQR_IN_IO          0x81    /* request is currently in IO */
 205 #define DASD_CQR_ERROR          0x82    /* request is completed with error */
 206 #define DASD_CQR_CLEAR_PENDING  0x83    /* request is clear pending */
 207 #define DASD_CQR_CLEARED        0x84    /* request was cleared */
 208 #define DASD_CQR_SUCCESS        0x85    /* request was successful */
 209 
 210 /* default expiration time*/
 211 #define DASD_EXPIRES      300
 212 #define DASD_EXPIRES_MAX  40000000
 213 #define DASD_RETRIES      256
 214 #define DASD_RETRIES_MAX  32768
 215 
 216 /* per dasd_ccw_req flags */
 217 #define DASD_CQR_FLAGS_USE_ERP   0      /* use ERP for this request */
 218 #define DASD_CQR_FLAGS_FAILFAST  1      /* FAILFAST */
 219 #define DASD_CQR_VERIFY_PATH     2      /* path verification request */
 220 #define DASD_CQR_ALLOW_SLOCK     3      /* Try this request even when lock was
 221                                          * stolen. Should not be combined with
 222                                          * DASD_CQR_FLAGS_USE_ERP
 223                                          */
 224 /*
 225  * The following flags are used to suppress output of certain errors.
 226  */
 227 #define DASD_CQR_SUPPRESS_NRF   4       /* Suppress 'No Record Found' error */
 228 #define DASD_CQR_SUPPRESS_FP    5       /* Suppress 'File Protected' error*/
 229 #define DASD_CQR_SUPPRESS_IL    6       /* Suppress 'Incorrect Length' error */
 230 #define DASD_CQR_SUPPRESS_CR    7       /* Suppress 'Command Reject' error */
 231 
 232 #define DASD_REQ_PER_DEV 4
 233 
 234 /* Signature for error recovery functions. */
 235 typedef struct dasd_ccw_req *(*dasd_erp_fn_t) (struct dasd_ccw_req *);
 236 
 237 /*
 238  * A single CQR can only contain a maximum of 255 CCWs. It is limited by
 239  * the locate record and locate record extended count value which can only hold
 240  * 1 Byte max.
 241  */
 242 #define DASD_CQR_MAX_CCW 255
 243 
 244 /*
 245  * Unique identifier for dasd device.
 246  */
 247 #define UA_NOT_CONFIGURED  0x00
 248 #define UA_BASE_DEVICE     0x01
 249 #define UA_BASE_PAV_ALIAS  0x02
 250 #define UA_HYPER_PAV_ALIAS 0x03
 251 
 252 struct dasd_uid {
 253         __u8 type;
 254         char vendor[4];
 255         char serial[15];
 256         __u16 ssid;
 257         __u8 real_unit_addr;
 258         __u8 base_unit_addr;
 259         char vduit[33];
 260 };
 261 
 262 /*
 263  * the struct dasd_discipline is
 264  * sth like a table of virtual functions, if you think of dasd_eckd
 265  * inheriting dasd...
 266  * no, currently we are not planning to reimplement the driver in C++
 267  */
 268 struct dasd_discipline {
 269         struct module *owner;
 270         char ebcname[8];        /* a name used for tagging and printks */
 271         char name[8];           /* a name used for tagging and printks */
 272 
 273         struct list_head list;  /* used for list of disciplines */
 274 
 275         /*
 276          * Device recognition functions. check_device is used to verify
 277          * the sense data and the information returned by read device
 278          * characteristics. It returns 0 if the discipline can be used
 279          * for the device in question. uncheck_device is called during
 280          * device shutdown to deregister a device from its discipline.
 281          */
 282         int (*check_device) (struct dasd_device *);
 283         void (*uncheck_device) (struct dasd_device *);
 284 
 285         /*
 286          * do_analysis is used in the step from device state "basic" to
 287          * state "accept". It returns 0 if the device can be made ready,
 288          * it returns -EMEDIUMTYPE if the device can't be made ready or
 289          * -EAGAIN if do_analysis started a ccw that needs to complete
 290          * before the analysis may be repeated.
 291          */
 292         int (*do_analysis) (struct dasd_block *);
 293 
 294         /*
 295          * This function is called, when new paths become available.
 296          * Disciplins may use this callback to do necessary setup work,
 297          * e.g. verify that new path is compatible with the current
 298          * configuration.
 299          */
 300         int (*verify_path)(struct dasd_device *, __u8);
 301 
 302         /*
 303          * Last things to do when a device is set online, and first things
 304          * when it is set offline.
 305          */
 306         int (*basic_to_ready) (struct dasd_device *);
 307         int (*online_to_ready) (struct dasd_device *);
 308         int (*basic_to_known)(struct dasd_device *);
 309 
 310         /*
 311          * Initialize block layer request queue.
 312          */
 313         void (*setup_blk_queue)(struct dasd_block *);
 314         /* (struct dasd_device *);
 315          * Device operation functions. build_cp creates a ccw chain for
 316          * a block device request, start_io starts the request and
 317          * term_IO cancels it (e.g. in case of a timeout). format_device
 318          * formats the device and check_device_format compares the format of
 319          * a device with the expected format_data.
 320          * handle_terminated_request allows to examine a cqr and prepare
 321          * it for retry.
 322          */
 323         struct dasd_ccw_req *(*build_cp) (struct dasd_device *,
 324                                           struct dasd_block *,
 325                                           struct request *);
 326         int (*start_IO) (struct dasd_ccw_req *);
 327         int (*term_IO) (struct dasd_ccw_req *);
 328         void (*handle_terminated_request) (struct dasd_ccw_req *);
 329         int (*format_device) (struct dasd_device *,
 330                               struct format_data_t *, int);
 331         int (*check_device_format)(struct dasd_device *,
 332                                    struct format_check_t *, int);
 333         int (*free_cp) (struct dasd_ccw_req *, struct request *);
 334 
 335         /*
 336          * Error recovery functions. examine_error() returns a value that
 337          * indicates what to do for an error condition. If examine_error()
 338          * returns 'dasd_era_recover' erp_action() is called to create a
 339          * special error recovery ccw. erp_postaction() is called after
 340          * an error recovery ccw has finished its execution. dump_sense
 341          * is called for every error condition to print the sense data
 342          * to the console.
 343          */
 344         dasd_erp_fn_t(*erp_action) (struct dasd_ccw_req *);
 345         dasd_erp_fn_t(*erp_postaction) (struct dasd_ccw_req *);
 346         void (*dump_sense) (struct dasd_device *, struct dasd_ccw_req *,
 347                             struct irb *);
 348         void (*dump_sense_dbf) (struct dasd_device *, struct irb *, char *);
 349         void (*check_for_device_change) (struct dasd_device *,
 350                                          struct dasd_ccw_req *,
 351                                          struct irb *);
 352 
 353         /* i/o control functions. */
 354         int (*fill_geometry) (struct dasd_block *, struct hd_geometry *);
 355         int (*fill_info) (struct dasd_device *, struct dasd_information2_t *);
 356         int (*ioctl) (struct dasd_block *, unsigned int, void __user *);
 357 
 358         /* suspend/resume functions */
 359         int (*freeze) (struct dasd_device *);
 360         int (*restore) (struct dasd_device *);
 361 
 362         /* reload device after state change */
 363         int (*reload) (struct dasd_device *);
 364 
 365         int (*get_uid) (struct dasd_device *, struct dasd_uid *);
 366         void (*kick_validate) (struct dasd_device *);
 367         int (*check_attention)(struct dasd_device *, __u8);
 368         int (*host_access_count)(struct dasd_device *);
 369         int (*hosts_print)(struct dasd_device *, struct seq_file *);
 370         void (*handle_hpf_error)(struct dasd_device *, struct irb *);
 371         void (*disable_hpf)(struct dasd_device *);
 372         int (*hpf_enabled)(struct dasd_device *);
 373         void (*reset_path)(struct dasd_device *, __u8);
 374 
 375         /*
 376          * Extent Space Efficient (ESE) relevant functions
 377          */
 378         int (*is_ese)(struct dasd_device *);
 379         /* Capacity */
 380         int (*space_allocated)(struct dasd_device *);
 381         int (*space_configured)(struct dasd_device *);
 382         int (*logical_capacity)(struct dasd_device *);
 383         int (*release_space)(struct dasd_device *, struct format_data_t *);
 384         /* Extent Pool */
 385         int (*ext_pool_id)(struct dasd_device *);
 386         int (*ext_size)(struct dasd_device *);
 387         int (*ext_pool_cap_at_warnlevel)(struct dasd_device *);
 388         int (*ext_pool_warn_thrshld)(struct dasd_device *);
 389         int (*ext_pool_oos)(struct dasd_device *);
 390         int (*ext_pool_exhaust)(struct dasd_device *, struct dasd_ccw_req *);
 391         struct dasd_ccw_req *(*ese_format)(struct dasd_device *,
 392                                            struct dasd_ccw_req *, struct irb *);
 393         int (*ese_read)(struct dasd_ccw_req *, struct irb *);
 394 };
 395 
 396 extern struct dasd_discipline *dasd_diag_discipline_pointer;
 397 
 398 /*
 399  * Notification numbers for extended error reporting notifications:
 400  * The DASD_EER_DISABLE notification is sent before a dasd_device (and it's
 401  * eer pointer) is freed. The error reporting module needs to do all necessary
 402  * cleanup steps.
 403  * The DASD_EER_TRIGGER notification sends the actual error reports (triggers).
 404  */
 405 #define DASD_EER_DISABLE 0
 406 #define DASD_EER_TRIGGER 1
 407 
 408 /* Trigger IDs for extended error reporting DASD_EER_TRIGGER notification */
 409 #define DASD_EER_FATALERROR  1
 410 #define DASD_EER_NOPATH      2
 411 #define DASD_EER_STATECHANGE 3
 412 #define DASD_EER_PPRCSUSPEND 4
 413 #define DASD_EER_NOSPC       5
 414 
 415 /* DASD path handling */
 416 
 417 #define DASD_PATH_OPERATIONAL  1
 418 #define DASD_PATH_TBV          2
 419 #define DASD_PATH_PP           3
 420 #define DASD_PATH_NPP          4
 421 #define DASD_PATH_MISCABLED    5
 422 #define DASD_PATH_NOHPF        6
 423 #define DASD_PATH_CUIR         7
 424 #define DASD_PATH_IFCC         8
 425 
 426 #define DASD_THRHLD_MAX         4294967295U
 427 #define DASD_INTERVAL_MAX       4294967295U
 428 
 429 struct dasd_path {
 430         unsigned long flags;
 431         u8 cssid;
 432         u8 ssid;
 433         u8 chpid;
 434         struct dasd_conf_data *conf_data;
 435         atomic_t error_count;
 436         unsigned long errorclk;
 437 };
 438 
 439 
 440 struct dasd_profile_info {
 441         /* legacy part of profile data, as in dasd_profile_info_t */
 442         unsigned int dasd_io_reqs;       /* number of requests processed */
 443         unsigned int dasd_io_sects;      /* number of sectors processed */
 444         unsigned int dasd_io_secs[32];   /* histogram of request's sizes */
 445         unsigned int dasd_io_times[32];  /* histogram of requests's times */
 446         unsigned int dasd_io_timps[32];  /* h. of requests's times per sector */
 447         unsigned int dasd_io_time1[32];  /* hist. of time from build to start */
 448         unsigned int dasd_io_time2[32];  /* hist. of time from start to irq */
 449         unsigned int dasd_io_time2ps[32]; /* hist. of time from start to irq */
 450         unsigned int dasd_io_time3[32];  /* hist. of time from irq to end */
 451         unsigned int dasd_io_nr_req[32]; /* hist. of # of requests in chanq */
 452 
 453         /* new data */
 454         struct timespec64 starttod;        /* time of start or last reset */
 455         unsigned int dasd_io_alias;        /* requests using an alias */
 456         unsigned int dasd_io_tpm;          /* requests using transport mode */
 457         unsigned int dasd_read_reqs;       /* total number of read  requests */
 458         unsigned int dasd_read_sects;      /* total number read sectors */
 459         unsigned int dasd_read_alias;      /* read request using an alias */
 460         unsigned int dasd_read_tpm;        /* read requests in transport mode */
 461         unsigned int dasd_read_secs[32];   /* histogram of request's sizes */
 462         unsigned int dasd_read_times[32];  /* histogram of requests's times */
 463         unsigned int dasd_read_time1[32];  /* hist. time from build to start */
 464         unsigned int dasd_read_time2[32];  /* hist. of time from start to irq */
 465         unsigned int dasd_read_time3[32];  /* hist. of time from irq to end */
 466         unsigned int dasd_read_nr_req[32]; /* hist. of # of requests in chanq */
 467         unsigned long dasd_sum_times;      /* sum of request times */
 468         unsigned long dasd_sum_time_str;   /* sum of time from build to start */
 469         unsigned long dasd_sum_time_irq;   /* sum of time from start to irq */
 470         unsigned long dasd_sum_time_end;   /* sum of time from irq to end */
 471 };
 472 
 473 struct dasd_profile {
 474         struct dentry *dentry;
 475         struct dasd_profile_info *data;
 476         spinlock_t lock;
 477 };
 478 
 479 struct dasd_format_entry {
 480         struct list_head list;
 481         sector_t track;
 482 };
 483 
 484 struct dasd_device {
 485         /* Block device stuff. */
 486         struct dasd_block *block;
 487 
 488         unsigned int devindex;
 489         unsigned long flags;       /* per device flags */
 490         unsigned short features;   /* copy of devmap-features (read-only!) */
 491 
 492         /* extended error reporting stuff (eer) */
 493         struct dasd_ccw_req *eer_cqr;
 494 
 495         /* Device discipline stuff. */
 496         struct dasd_discipline *discipline;
 497         struct dasd_discipline *base_discipline;
 498         void *private;
 499         struct dasd_path path[8];
 500         __u8 opm;
 501 
 502         /* Device state and target state. */
 503         int state, target;
 504         struct mutex state_mutex;
 505         int stopped;            /* device (ccw_device_start) was stopped */
 506 
 507         /* reference count. */
 508         atomic_t ref_count;
 509 
 510         /* ccw queue and memory for static ccw/erp buffers. */
 511         struct list_head ccw_queue;
 512         spinlock_t mem_lock;
 513         void *ccw_mem;
 514         void *erp_mem;
 515         void *ese_mem;
 516         struct list_head ccw_chunks;
 517         struct list_head erp_chunks;
 518         struct list_head ese_chunks;
 519 
 520         atomic_t tasklet_scheduled;
 521         struct tasklet_struct tasklet;
 522         struct work_struct kick_work;
 523         struct work_struct restore_device;
 524         struct work_struct reload_device;
 525         struct work_struct kick_validate;
 526         struct work_struct suc_work;
 527         struct work_struct requeue_requests;
 528         struct timer_list timer;
 529 
 530         debug_info_t *debug_area;
 531 
 532         struct ccw_device *cdev;
 533 
 534         /* hook for alias management */
 535         struct list_head alias_list;
 536 
 537         /* default expiration time in s */
 538         unsigned long default_expires;
 539         unsigned long default_retries;
 540 
 541         unsigned long blk_timeout;
 542 
 543         unsigned long path_thrhld;
 544         unsigned long path_interval;
 545 
 546         struct dentry *debugfs_dentry;
 547         struct dentry *hosts_dentry;
 548         struct dasd_profile profile;
 549         struct dasd_format_entry format_entry;
 550 };
 551 
 552 struct dasd_block {
 553         /* Block device stuff. */
 554         struct gendisk *gdp;
 555         struct request_queue *request_queue;
 556         spinlock_t request_queue_lock;
 557         struct blk_mq_tag_set tag_set;
 558         struct block_device *bdev;
 559         atomic_t open_count;
 560 
 561         unsigned long blocks;      /* size of volume in blocks */
 562         unsigned int bp_block;     /* bytes per block */
 563         unsigned int s2b_shift;    /* log2 (bp_block/512) */
 564 
 565         struct dasd_device *base;
 566         struct list_head ccw_queue;
 567         spinlock_t queue_lock;
 568 
 569         atomic_t tasklet_scheduled;
 570         struct tasklet_struct tasklet;
 571         struct timer_list timer;
 572 
 573         struct dentry *debugfs_dentry;
 574         struct dasd_profile profile;
 575 
 576         struct list_head format_list;
 577         spinlock_t format_lock;
 578 };
 579 
 580 struct dasd_attention_data {
 581         struct dasd_device *device;
 582         __u8 lpum;
 583 };
 584 
 585 struct dasd_queue {
 586         spinlock_t lock;
 587 };
 588 
 589 /* reasons why device (ccw_device_start) was stopped */
 590 #define DASD_STOPPED_NOT_ACC 1         /* not accessible */
 591 #define DASD_STOPPED_QUIESCE 2         /* Quiesced */
 592 #define DASD_STOPPED_PENDING 4         /* long busy */
 593 #define DASD_STOPPED_DC_WAIT 8         /* disconnected, wait */
 594 #define DASD_STOPPED_SU      16        /* summary unit check handling */
 595 #define DASD_STOPPED_PM      32        /* pm state transition */
 596 #define DASD_UNRESUMED_PM    64        /* pm resume failed state */
 597 #define DASD_STOPPED_NOSPC   128       /* no space left */
 598 
 599 /* per device flags */
 600 #define DASD_FLAG_OFFLINE       3       /* device is in offline processing */
 601 #define DASD_FLAG_EER_SNSS      4       /* A SNSS is required */
 602 #define DASD_FLAG_EER_IN_USE    5       /* A SNSS request is running */
 603 #define DASD_FLAG_DEVICE_RO     6       /* The device itself is read-only. Don't
 604                                          * confuse this with the user specified
 605                                          * read-only feature.
 606                                          */
 607 #define DASD_FLAG_IS_RESERVED   7       /* The device is reserved */
 608 #define DASD_FLAG_LOCK_STOLEN   8       /* The device lock was stolen */
 609 #define DASD_FLAG_SUSPENDED     9       /* The device was suspended */
 610 #define DASD_FLAG_SAFE_OFFLINE  10      /* safe offline processing requested*/
 611 #define DASD_FLAG_SAFE_OFFLINE_RUNNING  11      /* safe offline running */
 612 #define DASD_FLAG_ABORTALL      12      /* Abort all noretry requests */
 613 #define DASD_FLAG_PATH_VERIFY   13      /* Path verification worker running */
 614 #define DASD_FLAG_SUC           14      /* unhandled summary unit check */
 615 
 616 #define DASD_SLEEPON_START_TAG  ((void *) 1)
 617 #define DASD_SLEEPON_END_TAG    ((void *) 2)
 618 
 619 void dasd_put_device_wake(struct dasd_device *);
 620 
 621 /*
 622  * Reference count inliners
 623  */
 624 static inline void
 625 dasd_get_device(struct dasd_device *device)
 626 {
 627         atomic_inc(&device->ref_count);
 628 }
 629 
 630 static inline void
 631 dasd_put_device(struct dasd_device *device)
 632 {
 633         if (atomic_dec_return(&device->ref_count) == 0)
 634                 dasd_put_device_wake(device);
 635 }
 636 
 637 /*
 638  * The static memory in ccw_mem and erp_mem is managed by a sorted
 639  * list of free memory chunks.
 640  */
 641 struct dasd_mchunk
 642 {
 643         struct list_head list;
 644         unsigned long size;
 645 } __attribute__ ((aligned(8)));
 646 
 647 static inline void
 648 dasd_init_chunklist(struct list_head *chunk_list, void *mem,
 649                     unsigned long size)
 650 {
 651         struct dasd_mchunk *chunk;
 652 
 653         INIT_LIST_HEAD(chunk_list);
 654         chunk = (struct dasd_mchunk *) mem;
 655         chunk->size = size - sizeof(struct dasd_mchunk);
 656         list_add(&chunk->list, chunk_list);
 657 }
 658 
 659 static inline void *
 660 dasd_alloc_chunk(struct list_head *chunk_list, unsigned long size)
 661 {
 662         struct dasd_mchunk *chunk, *tmp;
 663 
 664         size = (size + 7L) & -8L;
 665         list_for_each_entry(chunk, chunk_list, list) {
 666                 if (chunk->size < size)
 667                         continue;
 668                 if (chunk->size > size + sizeof(struct dasd_mchunk)) {
 669                         char *endaddr = (char *) (chunk + 1) + chunk->size;
 670                         tmp = (struct dasd_mchunk *) (endaddr - size) - 1;
 671                         tmp->size = size;
 672                         chunk->size -= size + sizeof(struct dasd_mchunk);
 673                         chunk = tmp;
 674                 } else
 675                         list_del(&chunk->list);
 676                 return (void *) (chunk + 1);
 677         }
 678         return NULL;
 679 }
 680 
 681 static inline void
 682 dasd_free_chunk(struct list_head *chunk_list, void *mem)
 683 {
 684         struct dasd_mchunk *chunk, *tmp;
 685         struct list_head *p, *left;
 686 
 687         chunk = (struct dasd_mchunk *)
 688                 ((char *) mem - sizeof(struct dasd_mchunk));
 689         /* Find out the left neighbour in chunk_list. */
 690         left = chunk_list;
 691         list_for_each(p, chunk_list) {
 692                 if (list_entry(p, struct dasd_mchunk, list) > chunk)
 693                         break;
 694                 left = p;
 695         }
 696         /* Try to merge with right neighbour = next element from left. */
 697         if (left->next != chunk_list) {
 698                 tmp = list_entry(left->next, struct dasd_mchunk, list);
 699                 if ((char *) (chunk + 1) + chunk->size == (char *) tmp) {
 700                         list_del(&tmp->list);
 701                         chunk->size += tmp->size + sizeof(struct dasd_mchunk);
 702                 }
 703         }
 704         /* Try to merge with left neighbour. */
 705         if (left != chunk_list) {
 706                 tmp = list_entry(left, struct dasd_mchunk, list);
 707                 if ((char *) (tmp + 1) + tmp->size == (char *) chunk) {
 708                         tmp->size += chunk->size + sizeof(struct dasd_mchunk);
 709                         return;
 710                 }
 711         }
 712         __list_add(&chunk->list, left, left->next);
 713 }
 714 
 715 /*
 716  * Check if bsize is in { 512, 1024, 2048, 4096 }
 717  */
 718 static inline int
 719 dasd_check_blocksize(int bsize)
 720 {
 721         if (bsize < 512 || bsize > 4096 || !is_power_of_2(bsize))
 722                 return -EMEDIUMTYPE;
 723         return 0;
 724 }
 725 
 726 /* externals in dasd.c */
 727 #define DASD_PROFILE_OFF         0
 728 #define DASD_PROFILE_ON          1
 729 #define DASD_PROFILE_GLOBAL_ONLY 2
 730 
 731 extern debug_info_t *dasd_debug_area;
 732 extern struct dasd_profile dasd_global_profile;
 733 extern unsigned int dasd_global_profile_level;
 734 extern const struct block_device_operations dasd_device_operations;
 735 
 736 extern struct kmem_cache *dasd_page_cache;
 737 
 738 struct dasd_ccw_req *
 739 dasd_smalloc_request(int, int, int, struct dasd_device *, struct dasd_ccw_req *);
 740 struct dasd_ccw_req *dasd_fmalloc_request(int, int, int, struct dasd_device *);
 741 void dasd_sfree_request(struct dasd_ccw_req *, struct dasd_device *);
 742 void dasd_ffree_request(struct dasd_ccw_req *, struct dasd_device *);
 743 void dasd_wakeup_cb(struct dasd_ccw_req *, void *);
 744 
 745 struct dasd_device *dasd_alloc_device(void);
 746 void dasd_free_device(struct dasd_device *);
 747 
 748 struct dasd_block *dasd_alloc_block(void);
 749 void dasd_free_block(struct dasd_block *);
 750 
 751 enum blk_eh_timer_return dasd_times_out(struct request *req, bool reserved);
 752 
 753 void dasd_enable_device(struct dasd_device *);
 754 void dasd_set_target_state(struct dasd_device *, int);
 755 void dasd_kick_device(struct dasd_device *);
 756 void dasd_restore_device(struct dasd_device *);
 757 void dasd_reload_device(struct dasd_device *);
 758 void dasd_schedule_requeue(struct dasd_device *);
 759 
 760 void dasd_add_request_head(struct dasd_ccw_req *);
 761 void dasd_add_request_tail(struct dasd_ccw_req *);
 762 int  dasd_start_IO(struct dasd_ccw_req *);
 763 int  dasd_term_IO(struct dasd_ccw_req *);
 764 void dasd_schedule_device_bh(struct dasd_device *);
 765 void dasd_schedule_block_bh(struct dasd_block *);
 766 int  dasd_sleep_on(struct dasd_ccw_req *);
 767 int  dasd_sleep_on_queue(struct list_head *);
 768 int  dasd_sleep_on_immediatly(struct dasd_ccw_req *);
 769 int  dasd_sleep_on_queue_interruptible(struct list_head *);
 770 int  dasd_sleep_on_interruptible(struct dasd_ccw_req *);
 771 void dasd_device_set_timer(struct dasd_device *, int);
 772 void dasd_device_clear_timer(struct dasd_device *);
 773 void dasd_block_set_timer(struct dasd_block *, int);
 774 void dasd_block_clear_timer(struct dasd_block *);
 775 int  dasd_cancel_req(struct dasd_ccw_req *);
 776 int dasd_flush_device_queue(struct dasd_device *);
 777 int dasd_generic_probe (struct ccw_device *, struct dasd_discipline *);
 778 void dasd_generic_free_discipline(struct dasd_device *);
 779 void dasd_generic_remove (struct ccw_device *cdev);
 780 int dasd_generic_set_online(struct ccw_device *, struct dasd_discipline *);
 781 int dasd_generic_set_offline (struct ccw_device *cdev);
 782 int dasd_generic_notify(struct ccw_device *, int);
 783 int dasd_generic_last_path_gone(struct dasd_device *);
 784 int dasd_generic_path_operational(struct dasd_device *);
 785 void dasd_generic_shutdown(struct ccw_device *);
 786 
 787 void dasd_generic_handle_state_change(struct dasd_device *);
 788 int dasd_generic_pm_freeze(struct ccw_device *);
 789 int dasd_generic_restore_device(struct ccw_device *);
 790 enum uc_todo dasd_generic_uc_handler(struct ccw_device *, struct irb *);
 791 void dasd_generic_path_event(struct ccw_device *, int *);
 792 int dasd_generic_verify_path(struct dasd_device *, __u8);
 793 void dasd_generic_space_exhaust(struct dasd_device *, struct dasd_ccw_req *);
 794 void dasd_generic_space_avail(struct dasd_device *);
 795 
 796 int dasd_generic_read_dev_chars(struct dasd_device *, int, void *, int);
 797 char *dasd_get_sense(struct irb *);
 798 
 799 void dasd_device_set_stop_bits(struct dasd_device *, int);
 800 void dasd_device_remove_stop_bits(struct dasd_device *, int);
 801 
 802 int dasd_device_is_ro(struct dasd_device *);
 803 
 804 void dasd_profile_reset(struct dasd_profile *);
 805 int dasd_profile_on(struct dasd_profile *);
 806 void dasd_profile_off(struct dasd_profile *);
 807 char *dasd_get_user_string(const char __user *, size_t);
 808 
 809 /* externals in dasd_devmap.c */
 810 extern int dasd_max_devindex;
 811 extern int dasd_probeonly;
 812 extern int dasd_autodetect;
 813 extern int dasd_nopav;
 814 extern int dasd_nofcx;
 815 
 816 int dasd_devmap_init(void);
 817 void dasd_devmap_exit(void);
 818 
 819 struct dasd_device *dasd_create_device(struct ccw_device *);
 820 void dasd_delete_device(struct dasd_device *);
 821 
 822 int dasd_get_feature(struct ccw_device *, int);
 823 int dasd_set_feature(struct ccw_device *, int, int);
 824 
 825 int dasd_add_sysfs_files(struct ccw_device *);
 826 void dasd_remove_sysfs_files(struct ccw_device *);
 827 
 828 struct dasd_device *dasd_device_from_cdev(struct ccw_device *);
 829 struct dasd_device *dasd_device_from_cdev_locked(struct ccw_device *);
 830 struct dasd_device *dasd_device_from_devindex(int);
 831 
 832 void dasd_add_link_to_gendisk(struct gendisk *, struct dasd_device *);
 833 struct dasd_device *dasd_device_from_gendisk(struct gendisk *);
 834 
 835 int dasd_parse(void) __init;
 836 int dasd_busid_known(const char *);
 837 
 838 /* externals in dasd_gendisk.c */
 839 int  dasd_gendisk_init(void);
 840 void dasd_gendisk_exit(void);
 841 int dasd_gendisk_alloc(struct dasd_block *);
 842 void dasd_gendisk_free(struct dasd_block *);
 843 int dasd_scan_partitions(struct dasd_block *);
 844 void dasd_destroy_partitions(struct dasd_block *);
 845 
 846 /* externals in dasd_ioctl.c */
 847 int  dasd_ioctl(struct block_device *, fmode_t, unsigned int, unsigned long);
 848 
 849 /* externals in dasd_proc.c */
 850 int dasd_proc_init(void);
 851 void dasd_proc_exit(void);
 852 
 853 /* externals in dasd_erp.c */
 854 struct dasd_ccw_req *dasd_default_erp_action(struct dasd_ccw_req *);
 855 struct dasd_ccw_req *dasd_default_erp_postaction(struct dasd_ccw_req *);
 856 struct dasd_ccw_req *dasd_alloc_erp_request(char *, int, int,
 857                                             struct dasd_device *);
 858 void dasd_free_erp_request(struct dasd_ccw_req *, struct dasd_device *);
 859 void dasd_log_sense(struct dasd_ccw_req *, struct irb *);
 860 void dasd_log_sense_dbf(struct dasd_ccw_req *cqr, struct irb *irb);
 861 
 862 /* externals in dasd_3990_erp.c */
 863 struct dasd_ccw_req *dasd_3990_erp_action(struct dasd_ccw_req *);
 864 void dasd_3990_erp_handle_sim(struct dasd_device *, char *);
 865 
 866 /* externals in dasd_eer.c */
 867 #ifdef CONFIG_DASD_EER
 868 int dasd_eer_init(void);
 869 void dasd_eer_exit(void);
 870 int dasd_eer_enable(struct dasd_device *);
 871 void dasd_eer_disable(struct dasd_device *);
 872 void dasd_eer_write(struct dasd_device *, struct dasd_ccw_req *cqr,
 873                     unsigned int id);
 874 void dasd_eer_snss(struct dasd_device *);
 875 
 876 static inline int dasd_eer_enabled(struct dasd_device *device)
 877 {
 878         return device->eer_cqr != NULL;
 879 }
 880 #else
 881 #define dasd_eer_init()         (0)
 882 #define dasd_eer_exit()         do { } while (0)
 883 #define dasd_eer_enable(d)      (0)
 884 #define dasd_eer_disable(d)     do { } while (0)
 885 #define dasd_eer_write(d,c,i)   do { } while (0)
 886 #define dasd_eer_snss(d)        do { } while (0)
 887 #define dasd_eer_enabled(d)     (0)
 888 #endif  /* CONFIG_DASD_ERR */
 889 
 890 
 891 /* DASD path handling functions */
 892 
 893 /*
 894  * helper functions to modify bit masks for a given channel path for a device
 895  */
 896 static inline int dasd_path_is_operational(struct dasd_device *device, int chp)
 897 {
 898         return test_bit(DASD_PATH_OPERATIONAL, &device->path[chp].flags);
 899 }
 900 
 901 static inline int dasd_path_need_verify(struct dasd_device *device, int chp)
 902 {
 903         return test_bit(DASD_PATH_TBV, &device->path[chp].flags);
 904 }
 905 
 906 static inline void dasd_path_verify(struct dasd_device *device, int chp)
 907 {
 908         __set_bit(DASD_PATH_TBV, &device->path[chp].flags);
 909 }
 910 
 911 static inline void dasd_path_clear_verify(struct dasd_device *device, int chp)
 912 {
 913         __clear_bit(DASD_PATH_TBV, &device->path[chp].flags);
 914 }
 915 
 916 static inline void dasd_path_clear_all_verify(struct dasd_device *device)
 917 {
 918         int chp;
 919 
 920         for (chp = 0; chp < 8; chp++)
 921                 dasd_path_clear_verify(device, chp);
 922 }
 923 
 924 static inline void dasd_path_operational(struct dasd_device *device, int chp)
 925 {
 926         __set_bit(DASD_PATH_OPERATIONAL, &device->path[chp].flags);
 927         device->opm |= (0x80 >> chp);
 928 }
 929 
 930 static inline void dasd_path_nonpreferred(struct dasd_device *device, int chp)
 931 {
 932         __set_bit(DASD_PATH_NPP, &device->path[chp].flags);
 933 }
 934 
 935 static inline int dasd_path_is_nonpreferred(struct dasd_device *device, int chp)
 936 {
 937         return test_bit(DASD_PATH_NPP, &device->path[chp].flags);
 938 }
 939 
 940 static inline void dasd_path_clear_nonpreferred(struct dasd_device *device,
 941                                                 int chp)
 942 {
 943         __clear_bit(DASD_PATH_NPP, &device->path[chp].flags);
 944 }
 945 
 946 static inline void dasd_path_preferred(struct dasd_device *device, int chp)
 947 {
 948         __set_bit(DASD_PATH_PP, &device->path[chp].flags);
 949 }
 950 
 951 static inline int dasd_path_is_preferred(struct dasd_device *device, int chp)
 952 {
 953         return test_bit(DASD_PATH_PP, &device->path[chp].flags);
 954 }
 955 
 956 static inline void dasd_path_clear_preferred(struct dasd_device *device,
 957                                              int chp)
 958 {
 959         __clear_bit(DASD_PATH_PP, &device->path[chp].flags);
 960 }
 961 
 962 static inline void dasd_path_clear_oper(struct dasd_device *device, int chp)
 963 {
 964         __clear_bit(DASD_PATH_OPERATIONAL, &device->path[chp].flags);
 965         device->opm &= ~(0x80 >> chp);
 966 }
 967 
 968 static inline void dasd_path_clear_cable(struct dasd_device *device, int chp)
 969 {
 970         __clear_bit(DASD_PATH_MISCABLED, &device->path[chp].flags);
 971 }
 972 
 973 static inline void dasd_path_cuir(struct dasd_device *device, int chp)
 974 {
 975         __set_bit(DASD_PATH_CUIR, &device->path[chp].flags);
 976 }
 977 
 978 static inline int dasd_path_is_cuir(struct dasd_device *device, int chp)
 979 {
 980         return test_bit(DASD_PATH_CUIR, &device->path[chp].flags);
 981 }
 982 
 983 static inline void dasd_path_clear_cuir(struct dasd_device *device, int chp)
 984 {
 985         __clear_bit(DASD_PATH_CUIR, &device->path[chp].flags);
 986 }
 987 
 988 static inline void dasd_path_ifcc(struct dasd_device *device, int chp)
 989 {
 990         set_bit(DASD_PATH_IFCC, &device->path[chp].flags);
 991 }
 992 
 993 static inline int dasd_path_is_ifcc(struct dasd_device *device, int chp)
 994 {
 995         return test_bit(DASD_PATH_IFCC, &device->path[chp].flags);
 996 }
 997 
 998 static inline void dasd_path_clear_ifcc(struct dasd_device *device, int chp)
 999 {
1000         clear_bit(DASD_PATH_IFCC, &device->path[chp].flags);
1001 }
1002 
1003 static inline void dasd_path_clear_nohpf(struct dasd_device *device, int chp)
1004 {
1005         __clear_bit(DASD_PATH_NOHPF, &device->path[chp].flags);
1006 }
1007 
1008 static inline void dasd_path_miscabled(struct dasd_device *device, int chp)
1009 {
1010         __set_bit(DASD_PATH_MISCABLED, &device->path[chp].flags);
1011 }
1012 
1013 static inline int dasd_path_is_miscabled(struct dasd_device *device, int chp)
1014 {
1015         return test_bit(DASD_PATH_MISCABLED, &device->path[chp].flags);
1016 }
1017 
1018 static inline void dasd_path_nohpf(struct dasd_device *device, int chp)
1019 {
1020         __set_bit(DASD_PATH_NOHPF, &device->path[chp].flags);
1021 }
1022 
1023 static inline int dasd_path_is_nohpf(struct dasd_device *device, int chp)
1024 {
1025         return test_bit(DASD_PATH_NOHPF, &device->path[chp].flags);
1026 }
1027 
1028 /*
1029  * get functions for path masks
1030  * will return a path masks for the given device
1031  */
1032 
1033 static inline __u8 dasd_path_get_opm(struct dasd_device *device)
1034 {
1035         return device->opm;
1036 }
1037 
1038 static inline __u8 dasd_path_get_tbvpm(struct dasd_device *device)
1039 {
1040         int chp;
1041         __u8 tbvpm = 0x00;
1042 
1043         for (chp = 0; chp < 8; chp++)
1044                 if (dasd_path_need_verify(device, chp))
1045                         tbvpm |= 0x80 >> chp;
1046         return tbvpm;
1047 }
1048 
1049 static inline __u8 dasd_path_get_nppm(struct dasd_device *device)
1050 {
1051         int chp;
1052         __u8 npm = 0x00;
1053 
1054         for (chp = 0; chp < 8; chp++) {
1055                 if (dasd_path_is_nonpreferred(device, chp))
1056                         npm |= 0x80 >> chp;
1057         }
1058         return npm;
1059 }
1060 
1061 static inline __u8 dasd_path_get_ppm(struct dasd_device *device)
1062 {
1063         int chp;
1064         __u8 ppm = 0x00;
1065 
1066         for (chp = 0; chp < 8; chp++)
1067                 if (dasd_path_is_preferred(device, chp))
1068                         ppm |= 0x80 >> chp;
1069         return ppm;
1070 }
1071 
1072 static inline __u8 dasd_path_get_cablepm(struct dasd_device *device)
1073 {
1074         int chp;
1075         __u8 cablepm = 0x00;
1076 
1077         for (chp = 0; chp < 8; chp++)
1078                 if (dasd_path_is_miscabled(device, chp))
1079                         cablepm |= 0x80 >> chp;
1080         return cablepm;
1081 }
1082 
1083 static inline __u8 dasd_path_get_cuirpm(struct dasd_device *device)
1084 {
1085         int chp;
1086         __u8 cuirpm = 0x00;
1087 
1088         for (chp = 0; chp < 8; chp++)
1089                 if (dasd_path_is_cuir(device, chp))
1090                         cuirpm |= 0x80 >> chp;
1091         return cuirpm;
1092 }
1093 
1094 static inline __u8 dasd_path_get_ifccpm(struct dasd_device *device)
1095 {
1096         int chp;
1097         __u8 ifccpm = 0x00;
1098 
1099         for (chp = 0; chp < 8; chp++)
1100                 if (dasd_path_is_ifcc(device, chp))
1101                         ifccpm |= 0x80 >> chp;
1102         return ifccpm;
1103 }
1104 
1105 static inline __u8 dasd_path_get_hpfpm(struct dasd_device *device)
1106 {
1107         int chp;
1108         __u8 hpfpm = 0x00;
1109 
1110         for (chp = 0; chp < 8; chp++)
1111                 if (dasd_path_is_nohpf(device, chp))
1112                         hpfpm |= 0x80 >> chp;
1113         return hpfpm;
1114 }
1115 
1116 /*
1117  * add functions for path masks
1118  * the existing path mask will be extended by the given path mask
1119  */
1120 static inline void dasd_path_add_tbvpm(struct dasd_device *device, __u8 pm)
1121 {
1122         int chp;
1123 
1124         for (chp = 0; chp < 8; chp++)
1125                 if (pm & (0x80 >> chp))
1126                         dasd_path_verify(device, chp);
1127 }
1128 
1129 static inline __u8 dasd_path_get_notoperpm(struct dasd_device *device)
1130 {
1131         int chp;
1132         __u8 nopm = 0x00;
1133 
1134         for (chp = 0; chp < 8; chp++)
1135                 if (dasd_path_is_nohpf(device, chp) ||
1136                     dasd_path_is_ifcc(device, chp) ||
1137                     dasd_path_is_cuir(device, chp) ||
1138                     dasd_path_is_miscabled(device, chp))
1139                         nopm |= 0x80 >> chp;
1140         return nopm;
1141 }
1142 
1143 static inline void dasd_path_add_opm(struct dasd_device *device, __u8 pm)
1144 {
1145         int chp;
1146 
1147         for (chp = 0; chp < 8; chp++)
1148                 if (pm & (0x80 >> chp)) {
1149                         dasd_path_operational(device, chp);
1150                         /*
1151                          * if the path is used
1152                          * it should not be in one of the negative lists
1153                          */
1154                         dasd_path_clear_nohpf(device, chp);
1155                         dasd_path_clear_cuir(device, chp);
1156                         dasd_path_clear_cable(device, chp);
1157                         dasd_path_clear_ifcc(device, chp);
1158                 }
1159 }
1160 
1161 static inline void dasd_path_add_cablepm(struct dasd_device *device, __u8 pm)
1162 {
1163         int chp;
1164 
1165         for (chp = 0; chp < 8; chp++)
1166                 if (pm & (0x80 >> chp))
1167                         dasd_path_miscabled(device, chp);
1168 }
1169 
1170 static inline void dasd_path_add_cuirpm(struct dasd_device *device, __u8 pm)
1171 {
1172         int chp;
1173 
1174         for (chp = 0; chp < 8; chp++)
1175                 if (pm & (0x80 >> chp))
1176                         dasd_path_cuir(device, chp);
1177 }
1178 
1179 static inline void dasd_path_add_ifccpm(struct dasd_device *device, __u8 pm)
1180 {
1181         int chp;
1182 
1183         for (chp = 0; chp < 8; chp++)
1184                 if (pm & (0x80 >> chp))
1185                         dasd_path_ifcc(device, chp);
1186 }
1187 
1188 static inline void dasd_path_add_nppm(struct dasd_device *device, __u8 pm)
1189 {
1190         int chp;
1191 
1192         for (chp = 0; chp < 8; chp++)
1193                 if (pm & (0x80 >> chp))
1194                         dasd_path_nonpreferred(device, chp);
1195 }
1196 
1197 static inline void dasd_path_add_nohpfpm(struct dasd_device *device, __u8 pm)
1198 {
1199         int chp;
1200 
1201         for (chp = 0; chp < 8; chp++)
1202                 if (pm & (0x80 >> chp))
1203                         dasd_path_nohpf(device, chp);
1204 }
1205 
1206 static inline void dasd_path_add_ppm(struct dasd_device *device, __u8 pm)
1207 {
1208         int chp;
1209 
1210         for (chp = 0; chp < 8; chp++)
1211                 if (pm & (0x80 >> chp))
1212                         dasd_path_preferred(device, chp);
1213 }
1214 
1215 /*
1216  * set functions for path masks
1217  * the existing path mask will be replaced by the given path mask
1218  */
1219 static inline void dasd_path_set_tbvpm(struct dasd_device *device, __u8 pm)
1220 {
1221         int chp;
1222 
1223         for (chp = 0; chp < 8; chp++)
1224                 if (pm & (0x80 >> chp))
1225                         dasd_path_verify(device, chp);
1226                 else
1227                         dasd_path_clear_verify(device, chp);
1228 }
1229 
1230 static inline void dasd_path_set_opm(struct dasd_device *device, __u8 pm)
1231 {
1232         int chp;
1233 
1234         for (chp = 0; chp < 8; chp++) {
1235                 dasd_path_clear_oper(device, chp);
1236                 if (pm & (0x80 >> chp)) {
1237                         dasd_path_operational(device, chp);
1238                         /*
1239                          * if the path is used
1240                          * it should not be in one of the negative lists
1241                          */
1242                         dasd_path_clear_nohpf(device, chp);
1243                         dasd_path_clear_cuir(device, chp);
1244                         dasd_path_clear_cable(device, chp);
1245                         dasd_path_clear_ifcc(device, chp);
1246                 }
1247         }
1248 }
1249 
1250 /*
1251  * remove functions for path masks
1252  * the existing path mask will be cleared with the given path mask
1253  */
1254 static inline void dasd_path_remove_opm(struct dasd_device *device, __u8 pm)
1255 {
1256         int chp;
1257 
1258         for (chp = 0; chp < 8; chp++) {
1259                 if (pm & (0x80 >> chp))
1260                         dasd_path_clear_oper(device, chp);
1261         }
1262 }
1263 
1264 /*
1265  * add the newly available path to the to be verified pm and remove it from
1266  * normal operation until it is verified
1267  */
1268 static inline void dasd_path_available(struct dasd_device *device, int chp)
1269 {
1270         dasd_path_clear_oper(device, chp);
1271         dasd_path_verify(device, chp);
1272 }
1273 
1274 static inline void dasd_path_notoper(struct dasd_device *device, int chp)
1275 {
1276         dasd_path_clear_oper(device, chp);
1277         dasd_path_clear_preferred(device, chp);
1278         dasd_path_clear_nonpreferred(device, chp);
1279 }
1280 
1281 /*
1282  * remove all paths from normal operation
1283  */
1284 static inline void dasd_path_no_path(struct dasd_device *device)
1285 {
1286         int chp;
1287 
1288         for (chp = 0; chp < 8; chp++)
1289                 dasd_path_notoper(device, chp);
1290 
1291         dasd_path_clear_all_verify(device);
1292 }
1293 
1294 /* end - path handling */
1295 
1296 #endif                          /* DASD_H */
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root/drivers/s390/block/dasd_int.h

INCLUDED FROM

DEFINITIONS
